iray shader - can object cast shadow only?

Ikyoto

I don't need the object to show, just a soft shadow of it cast over the surfaces behind it - got a ghost to do.

I can do it with paper and pencil, but really would like a way to render it in daz studio 4.8.0.59.∞

Any ideas?

Richard Haseltine

Not with the default Photoreal mode, I'm not sure using the Interactive mode (which certainly allows an item not to cast a shadow). You could always use Canvasses with Light Path Expressions to do two renders - a shadow pass with everything in the scene and then a shadowless pass witht the hidden object excluded - and set the former over the latter in Multiply mode - but I've not tried anything like that and don't know how hard it would be to set up.